We present limits on transit timing variations and secondary eclipse depth variations at 8 microns with the Spitzer Space Telescope IRAC camera. Due to the weak limb darkening in the infrared and uninterrupted observing, Spitzer provides the highest accuracy transit times for this bright system, in principle providing sensitivity to secondary planets of Mars mass in resonant orbits. Finally, the transit data provides tighter constraints on the wavelength- dependent atmospheric absorption by the planet.
@article{arxiv.0807.2434,
title = {Transits and secondary eclipses of HD 189733 with Spitzer},
author = {Eric Agol and Nicolas B. Cowan and James Bushong and Heather Knutson and David Charbonneau and Drake Deming and Jason H. Steffen},
journal= {arXiv preprint arXiv:0807.2434},
year = {2009}
}
Comments
7 pages, 7 figures, submitted to proceedings of IAU Symposium No. 253 "Transiting Planets"